Pbフリーはんだの金属学的基礎


(7−3) SACの低融点化

(7−3−1) SAC+Bi

 シャープ
SAC系およびSACB系はんだボールCSP

 はんだボールとペーストの組み合わせ








Kanchanomai


Kanchanomai






Suhling
 SAC387
 Sn−3.35Ag−1.0Cu−3.3Bi
 Sn−3.8Ag−0.7Cu−2.0Bi
 Sn−3.0Ag−0.5Cu−8.0In
 PWB:ENIG






dfr



Celestica

 基板の表面処理

 端子めっきはSn−PbあるいはマットSn、はんだボールはSAC305







 Cuを含まないはんだ(SnAgBi、Paul,orchid)はNi系基体との間に不規則なIMCを形成。


Zhao

The growth kinetics of interfacial IMC layers versus the aging time at two temperatures: (a) 140 °C and (b) 180 °C. The solid squares, circles and triangle represent the relative thickness of total interfacial layers in Sn-3Ag-0.5Cu/Cu, Sn-3Ag-0.5Cu-1Bi/Cu, and Sn-3Ag-0.5Cu-3Bi/Cu, respectively. The hollow ones in the bottom of (b) represent the thickness of Cu3Sn layer.

The microstructure evolution of Sn-3Ag-0.5Cu/Cu and Sn-3Ag-0.5Cu-3Bi/Cu joint samples during aging process: (a) 0Bi, as soldered; (b) 3Bi, as soldered; (c) 0Bi, aged at 150 °C for 1000 h; (d) 3Bi, aged at 150 °C for 1000 h

Shear fracture morphology of the couples aged at 140 °C: (a) 360 h, aged at 140 °C, Sn3Ag0.5Cu/Cu; (b) 600 h, aged at 140 °C, Sn3Ag0.5Cu/Cu; (c) 360 h, aged at 140 °C, Sn3Ag0.5Cu3Bi/Cu; (d) 600 h, aged at 140 °C, Sn3Ag0.5Cu3Bi/Cu


(7−3−2) SAC+In

 Sharif In  電解Niと無電解Ni(16P)、Auは0.5μm
 Sn−9In−3.5Ag−0.5Cu
 


 
 アサヒ
 


(7−3−3) SAC+In+Bi


 Fe、In+Ce
塩化亜鉛フラックス









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inserted by FC2 system